Via Instructables.com I found four DIY puzzles (Puzzle 1, Puzzle 2, Puzzle 3 and Puzzle 4) you can make yourself and when finished you can try to solve them yourself or by your friends.

All you need do is visit your local DIY shop and buy the materials provided in the list. It’s just simple materials you need to make each of the four puzzles; some small wooden balls, piece of wood, brass curtain rings and some nylon strings. Happy Puzzling!